?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Do+stocking+rate+and+a+simple+run+management+practice+in%C3%AF%C2%AC%C2%82uence+the+infection+of+laying+hens+with+gastrointestinal+helminths%3F&rft.creator=Heckendorn%2C+F.&rft.creator=H%C3%83%C2%A4ring%2C+D.A.&rft.creator=Amsler%2C+Z.&rft.creator=Maurer%2C+V.&rft.subject=+Poultry&rft.subject=+Health+and+welfare&rft.description=The+aim+of+this+experiment+conducted+at+four+sites+in+Switzerland+was+to+investigate+the+transmission+and+infectivity+of+the+two+main+helminth+parasite+species+of+poultry+(Ascaridia+galli+and+Heterakis+gallinarum)+in+outdoor+runs+with+two+different+stocking+rates.%0D%0AAdditionally%2C+the+in%C3%AF%C2%AC%C2%82uence+of+a+simplemanagement+practice+(mowing+of+run)+on+helminth+transmission+was+studied.+Three+run+types+were+created+on+each+site%3A+runs+C+served+as+control+(stocking+rate+10+m2%2Fhen%2C+no+management)%2C+runs+B+corresponded+to+runs+C+but+were+managed+(10+m2%2Fhen%2C+management).+In+runs+A+stocking+rates+were+doubled+compared+to+control+runs+(5+m2%2Fhen%2C+no+management).+During+two+subsequent+layer+%C3%AF%C2%AC%C2%82ocks%2C+a+set+of+parasitological+parameters+(faecal+egg+counts+(FECs)%2C+prevalence%2C+worm+burdens+in+hens+and+in+tracer+animals%2C+helminth+eggs+in+soil)+as+well+as+parameters+describing+the+run+vegetation+were+determined.+The+increased+stocking+rate+(runs+A)+led+to+a+larger+proportion+of+bare+soil+and+to+a+reduction+of+the+average+vegetation+height.+In+runs+with+a+lower+stocking+rate+(B+and+C)%2C+the+proportion+of+bare+soil+did+not+increase+during+the+experimental+period.+Irrespective+of+the+run+type%2C+numbers+of+helminth+eggs+in+the+soil+decreased+signi%C3%AF%C2%AC%C2%81cantly+with+an+increasing+distance+to+the+hen+houses%2C+while+the+percentage+of+ground+coverage+as+well+as+vegetation+height+increased.+However%2C+across+runs+the+correlation+between+the+percentage+of+ground+cover+and+the+values+of+eggs+per+gram+soil+between+runs+was+very+low+(r2+%3D+0.0007%2C+P+%3D+0.95)+indicating+a+non+causal+relationship.+Signi%C3%AF%C2%AC%C2%81cant+differences+in+FEC+were+found+in+%C3%AF%C2%AC%C2%82ock+2+(P+%3C+0.001)%3A+FEC+of+hens+in+managed+runs+Bwere+24%25+lower+(P+%3C+0.05)+than+those+of+the+control+animals.+Although+not+signi%C3%AF%C2%AC%C2%81cant%2C+the+corresponding+prevalence+was+lower+(-9.7%25)+in+hens+from+managed+runs+as+well.+Hens+from+runs+with+a+high+stocking+rate+(A)+had+signi%C3%AF%C2%AC%C2%81cantly+higher+FEC+than+hens+from+control+runs+(C).+In+%C3%AF%C2%AC%C2%82ock+2+management+(n.s.)+and+higher+stocking+rates+(-62%25%2C+P+%3C+0.05)+decreased+the+worm+burdens.+Tracer+animals+from+runs+with+a+high+stocking+rate+(A)+had+signi%C3%AF%C2%AC%C2%81cantly+higher+FEC+than+tracers+from+runs+B+and+C+in+two+tracer+series.+This+was+not+re%C3%AF%C2%AC%C2%82ected+in+the+worm+burdens.+Overall%2C+the+stocking+rate+of+hens+in+the+outdoor+run+seemed+not+to+in%C3%AF%C2%AC%C2%82uence+the+transmission+patterns+of+A.+galli+and+H.+gallinarum+and+repeated+mowing+of+runs+did+not+reduce+helminth+infections.+Lower+stocking+rates%2C+however%2C+led+to+a+substantial+improvement+of+the+run+vegetation.%0D%0A(c)+2008+Elsevier+B.V.+All+rights+reserved.&rft.publisher=Elsevier+B.V.&rft.date=2009&rft.type=Journal+paper&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Forgprints.org%2F15621%2F1%2FHeckendorn_2009_Vet_Parasitol.pdf&rft.identifier=Heckendorn%2C+F.%3B+H%C3%83%C2%A4ring%2C+D.A.%3B+Amsler%2C+Z.+and+Maurer%2C+V.+(2009)+Do+stocking+rate+and+a+simple+run+management+practice+in%C3%AF%C2%AC%C2%82uence+the+infection+of+laying+hens+with+gastrointestinal+helminths%3F+Veterinary+Parasitology+(159)%2C+pp.+60-68.&rft.relation=http%3A%2F%2Forgprints.org%2F15621%2F